Error execute vim.schedule: `attempt to index field defaultBranchRef` when do `octo repo list`, picker fzf-lua

[RAULLLLL]

Issue Description

Type: bug report

Describe what happened

Error when do :Octo repo list with picker fzf-lua (but okay with telescope)

Error executing vim.schedule lua callback: ....local/share/nvim/lazy/octo.nvim/lua/octo/ui/writers.lua:89: attempt to index field 'defaultBranchRef' (a userdata value)
stack traceback:
	....local/share/nvim/lazy/octo.nvim/lua/octo/ui/writers.lua:89: in function 'write_repo'
	...share/nvim/lazy/octo.nvim/lua/octo/model/octo-buffer.lua:89: in function 'render_repo'
	...m/lazy/octo.nvim/lua/octo/pickers/fzf-lua/previewers.lua:318: in function 'cb'
	...0x/.local/share/nvim/lazy/octo.nvim/lua/octo/gh/init.lua:160: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

How to reproduce it (as minimally and precisely as possible)

1. :Octo repo list
2. Error

Tell us your environment

nvim nightly latest

[Milo Gertjejansen]

I think the problem is that you have a repository that doesn't have any default branch set. I'll work on fixing this though, thanks!